Mitsubishi Lancer Evolution IX. Manual - part 465

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-335

• Voltage between terminal No. 2 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Check and repair harness between A-06X 

(terminal No. 3) condenser fan relay (low) 
connector and C-121 (terminal No. 31) 
engine-ECU connector.

• Check power supply for open circuit.

STEP 12. Connector check: A-34 condenser fan 
motor connector.

Q: Is the check result normal? 

YES : 

Go to Step 13 .

NO : 

Repair or replace the connector.

STEP 13. Check harness between A-06X 
(terminal No. 3) condenser fan relay (low) 
connector and C-121 (terminal No. 31) 
engine-ECU connector.

NOTE: Before checking harness, check intermediate 
connector A-29*

1

 or C-31*

2

, and repair if necessary.

• Check output line for damage.

Q: Is the check result normal? 

YES : 

Replace the engine-ECU.

NO : 

Repair the damaged harness wire.

AK305266

1

2

A-34(B)

AB

Harness side 
connector

Connector: A-34

AK305265

2

1

3

4

Relay box's 
triangle marks

AB

A-06X

Harness side
connector

Connector: A-06X

AK501995

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

Connector: C-121

C-121 (GR)

C-121 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-336

STEP 14. M.U.T.-II/III actuator test

• Item No. 38: Condenser fan (high)

OK: Condenser fan motor rotates (high 
speed)

Q: Is the check result normal?

YES : 

Replace the engine-ECU.

NO : 

Go to Step 15 .

STEP 15. Connector check: A-07X condenser fan 
relay (high) connector.

Q: Is the check result normal? 

YES : 

Go to Step 16 .

NO : 

Repair or replace the connector.

STEP 16. Check condenser fan relay (high).

• Check condenser fan relay (high) (Refer to 

GROUP 55 

− On-vehicle Service 

P.55-107

).

Q: Is the check result normal? 

YES : 

Go to Step 17 .

NO : 

Replace the condenser fan relay (high).

STEP 17. Perform voltage measurement at A-07X 
condenser fan relay (high) connector.

• Remove relay, and measure at relay box side.

• Ignition switch: "ON"

• Voltage between terminal No. 2 and earth.

OK: System voltage

Q: Is the check result normal? 

YES : 

Go to Step 20 .

NO : 

Go to Step 18 .

AK305267

2

1

3

4

A-07X

Connector: A-07X

AB

Harness side
connector

Relay box’s
triangle marks

AK305267

2

1

3

4

A-07X

Connector: A-07X

AB

Harness side
connector

Relay box’s
triangle marks

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-337

STEP 18. Connector check: C-208 ignition switch 
connector.

Q: Is the check result normal? 

YES : 

Go to Step 19 .

NO : 

Repair or replace the connector.

STEP 19. Check ignition switch.

• Check ignition switch (Refer to GROUP 54 − igni-

tion switch           

P.54A-30

).

Q: Is the check result normal? 

YES : 

Check intermediate connectors C-101, 

C-129, C-210 and C-211 and repair if 
necessary. If intermediate connectors are 
normal, check and repair harness between 
A-07X (terminal No. 2) condenser fan relay 
(high) connector and C-208 (terminal No. 4) 
ignition switch connector.

• Check power supply for open circuit 

and damage.

NO : 

Replace the ignition switch.

AK305251

1

2

3

4

5

6

Harness side connector

Connector: C-208

C-208

<L. H. drive vehicles>

<R. H. drive vehicles>

C-208

AB

AK305267

2

1

3

4

A-07X

Connector: A-07X

AB

Harness side
connector

Relay box’s
triangle marks

AK305251

1

2

3

4

5

6

Harness side connector

Connector: C-208

C-208

<L. H. drive vehicles>

<R. H. drive vehicles>

C-208

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-338

STEP 20. Perform voltage measurement at A-07X 
condenser fan relay (high) connector.

• Remove relay, and measure at relay box side.

• Voltage between terminal No. 4 and earth.

OK: System voltage

Q: Is the check result normal? 

YES : 

Check and repair harness between battery 

and A-07X (terminal No. 4) condenser fan 
relay (high) connector.

• Check power supply for open circuit 

and damage.

NO : 

Go to Step 21 .

STEP 21. Perform voltage measurement at C-121 
engine-ECU connector.

• Measure engine-ECU terminal voltage.

• Ignition switch: "ON"

• Voltage between terminal No. 30 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 23 .

NO : 

Go to Step 22 .

AK305267

2

1

3

4

A-07X

Connector: A-07X

AB

Harness side
connector

Relay box’s
triangle marks

AK501995

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

AB

Connector: C-121

C-121 (GR)

C-121 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>